Receiver cover and accessory rail

ABSTRACT

A cover for a receiver of a gun that may include an elongated member having a first longitudinal axis, the elongated member including a distal end portion which may include a leading edge which is configured and dimensioned to connect with a gun part, and a proximal end portion which is spaced from the distal end portion along the first longitudinal axis. The elongated member may include a first locking mechanism adjacent the proximal end wall. The first locking mechanism may be secured to a recoil spring guide of the gun. Also, the elongated member may include a second locking mechanism adjacent the distal end portion. The second locking mechanism may be secured to a rear sight base of the gun. The elongated member may include an accessory rail.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/195,791 filed on Jul. 22, 2015. U.S. Provisional Application No.62/195,791 is incorporated by reference herein in its entirety.

FIELD OF THE INVENTION

The invention relates to a receiver cover for a small arms weapon. Moreparticularly, the invention relates to a receiver cover for a gun, suchas an AK-47 variant rifle.

BACKGROUND

A firearm operator may find it advantageous to have specialized opticalsighting equipment (or other tactical accessories) mounted on theirservice weapon. Accordingly, there exists a need for a receiver coverfor a gun which may provide a stable platform for mounting a tacticalaccessory.

SUMMARY

Hence, the present disclosure is directed toward a cover for a receiverof a gun that includes an elongated member having a first longitudinalaxis, the elongated member including a distal end portion which includesa leading edge which is configured and dimensioned to connect with a gunpart, and a proximal end portion which is spaced from the distal endportion along the first longitudinal axis. The elongated member mayinclude a proximal end wall, a proximal rim adjacent the proximal endwall, and a first locking mechanism adjacent the proximal end wall. Thefirst locking member, may include an anchor, a positioning memberconnected to the anchor such that movement of the positioning membermoves the anchor with respect to the proximal rim. The locking mechanismmay include a blocking member operatively associated with thepositioning member. The first locking mechanism may include first andsecond operable configurations such that in the first configuration theblocking member arrests movement of the positioning member, and suchthat in the second configuration the blocking member allows movement ofthe positioning member.

The positioning member may be movable with respect to the anchor. Thepositioning member may be rotatable with respect to the anchor. Thepositioning member and the anchor may be connected by mating screwthreads. Rotation of the positioning member in one direction may movethe anchor away from the proximal rim. Counter rotation of thepositioning member may move the anchor toward the proximal rim.

The anchor may include a body which has a first surface, a secondsurface spaced from the first surface, and a passage extending from thefirst surface toward the second surface. The passage may include a firstside wall. The first side wall may be situated between the proximal rimand the blocking member. The first side wall may be positioned to anchoragainst a recoil spring guide of a gun, such as an AK-47 variant rifle.The passage may extend from the first surface to the second surface.

The positioning member may include a shaft that is connected to thebody. The positioning member further may include a knob connected to theshaft such that moving the knob regulates the position of the anchorwith respect to the proximal rim. The shaft may have a secondlongitudinal axis and the knob may be rotatable about the secondlongitudinal axis. The knob may be fixed to the shaft. The knob mayinclude a first exterior surface, and the first exterior surface mayinclude a plurality of recesses, the plurality of recesses beingselectively positionable opposite the locking member. Each of theplurality of recesses may be configured and dimensioned to engage thelocking member to fix the position of the knob. The locking member mayinclude a smooth ball spring plunger.

The cover may include a second locking mechanism adjacent the distal endportion. The second locking mechanism may include a lever which includesa distal end and a proximal end, the distal end of the lever beingpositioned adjacent the leading edge. The second locking mechanism mayinclude a biasing member positioned between the elongated member and thelever. The second locking mechanism may include third and fourthconfigurations such that in the third configuration the distal end ofthe lever is biased toward the leading edge, and such that in the fourthconfiguration the proximal end of the lever compresses the biasingmember.

The elongated member may form a housing that is configured anddimensioned to releasably connect to a receiver of a gun, such as anAK-47 variant rifle. The elongated member may include a tacticalaccessory rail.

DESCRIPTION OF THE DRAWINGS

In the accompanying drawings, which form part of this specification andare to be read in conjunction therewith and in which like referencenumerals are used to indicate like parts in the various views:

FIG. 1 is a perspective view of a rifle with an exemplary embodiment ofa receiver cover;

FIG. 2 is an upper rear port side perspective view of the receiver coverof FIG. 1;

FIG. 3 is an upper rear starboard side perspective view of the receivercover of FIG. 1;

FIG. 4 is an upper front starboard side perspective view of the receivercover of FIG. 1;

FIG. 5 is a lower rear port side perspective view of the receiver coverof FIG. 1;

FIG. 6 is a bottom perspective view of the receiver cover of FIG. 1;

FIG. 7 is a bottom view of the receiver cover of FIG. 1;

FIG. 8 is a front view of the receiver cover of FIG. 1;

FIG. 9 is a rear view of the receiver cover of FIG. 1;

FIG. 10 is a rear perspective view of the receiver cover of FIG. 1secured to the receiver of a rifle;

FIG. 11 is partial sectional view of the receiver cover and rifle ofFIG. 10;

FIG. 12 is a partial perspective view of the rifle of FIG. 11;

FIG. 13 is an exploded view of the locking mechanism at the rear end ofthe receiver cover of FIG. 1;

FIG. 14 is a partial sectional view of the rear end of the receivercover of FIG. 10;

FIG. 15 is a perspective view of selected components of FIG. 10;

FIG. 16 is a cross sectional view of FIG. 11, along line 16-16;

FIG. 17 is a cross sectional view of FIG. 14, along line 17-17;

FIG. 18 is a cross sectional view of FIG. 17, along line 18-18;

FIG. 19 is a perspective view of selected components of FIG. 10;

FIG. 20 is a cross sectional view of FIG. 17, along line 20-20;

FIG. 21 is a cross sectional view of FIG. 17, along line 21-21;

FIG. 22 is an exploded view of the locking mechanism at the front of thereceiver cover of FIG. 1;

FIG. 23 is a cross sectional view of FIG. 11, along line 23-23;

FIG. 24 is a perspective view of selected components of FIG. 10;

FIG. 25 is a cross sectional view of FIG. 23, along line 25-25;

FIG. 26 is a perspective view of selected components of FIG. 10;

FIG. 27 is an upper port side perspective view of the rear end of thereceiver cover of FIG. 1 without selected components of the rear endlocking mechanism;

FIG. 28 is a bottom perspective view of FIG. 27;

FIG. 29 is an upper starboard side perspective view of the front end ofthe receiver cover of FIG. 1 without selected components of the frontend locking mechanism;

FIG. 30 is a bottom perspective view of FIG. 29;

FIG. 31 is a perspective view of the thumb knob of the rear end lockingmechanism of FIG. 10;

FIG. 32 is a side view of the thumb knob of FIG. 31;

FIG. 33 is a bottom view of the thumb knob of FIG. 31;

FIG. 34 is a perspective view of the yoke of the rear end lockingmechanism of FIG. 10;

FIG. 35 is another perspective view of the yoke of FIG. 34;

FIG. 36 is a top view of the yoke of FIG. 34;

FIG. 37 is a bottom view of the yoke of FIG. 34;

FIG. 38 is a side view of the yoke of FIG. 34;

FIG. 39 is a front view of the upper clamping member of the front endlocking mechanism of FIG. 10;

FIG. 40 is an upper front port side perspective view of the upperclamping member of FIG. 39;

FIG. 41 is a bottom rear port side perspective view of the upperclamping member of FIG. 39;

FIG. 42 is a side view of the upper clamping member of FIG. 39;

FIG. 43 is a perspective view of an AK-47 rifle with the receiver coverremoved;

FIG. 44 is a perspective view of the AK-47 rifle of FIG. 43 with thefront end of the receiver cover being secured to the rear sight base;and

FIG. 45 is a perspective view of the AK-47 rifle of FIG. 43 with therear end of the receiver cover being secured to the recoil spring guideand rear trunnion.

DESCRIPTION

FIG. 1 shows an exemplary embodiment of a receiver cover 10 for an AK-47variant rifle 12 in accordance with the present invention. The receivercover may be configured and dimensioned to interlock with componentparts of an AK-47 variant rifle (e.g., the rear sight base 14 and reartrunnion 16). Referring to FIG. 2 the receiver cover 10 may include anelongated cover portion 18 that includes a rear sight base connectionsite 20, a rear trunnion connection site 22, and an accessory rail(e.g., a Picatinny rail) 24. As shown in FIG. 2 and FIG. 3, theaccessory rail may include a plurality of recoil grooves 26. Theplurality of recoil groves 26 may be uniformly spaced along thelongitudinal axis of the accessory rail. The shape and orientation ofthe plurality of recoil grooves may be the same, and the plurality ofrecoil grooves may be parallel grooves. The accessory mounting rail maybe a Picatinny rail that meets the requirements of MIL-STD-1913. Also,the receiver cover may include a distal end receiver cover lockingmechanism 28 and a proximal end receiver cover locking mechanism 30.

FIG. 4 shows a front starboard side perspective view of the receivercover 10 of FIG. 1. The distal end receiver cover locking mechanism 28may include an upper clamping member 32 and a lower clamping member 34.The upper clamping member 34 may include a spring loaded lever arm (orcantilever) 36 that is mounted within the distal end (or front end) ofthe accessory rail. As shown in FIG. 22 and FIG. 23, the spring loadedlever arm 36 may be formed from a lever 38, a fulcrum 40, a pivot 42 andone or more biasing members 44. In the exemplary embodiment, the biasingmembers 44 may be two compression springs mounted between the bottomsurface 46 of the lever arm recess 48 and the lever arm 38 on theproximal side of the fulcrum. Preferably, the compression springs 44provide a strong and secure clamping force. The spring loaded lever arm36 may be biased such that the distal end of the lever is positionedtoward the lower clamping member 34. By contrast, the lower clampingmember 34 may be a static member. For example, the lower clamping member34 may include a projecting leading edge 50 of the receiver cover.Referring to FIG. 23 and FIG. 24, the projecting edge 50 may be shapedto interconnect with a mating groove 52 on an opposing surface of theAK-47 variant rifle 12. For example, the mating groove 52 may be acurved recess in the rear sight base 20 of the rifle (see e.g., FIG.24). As shown in FIG. 24 and FIG. 25, when the receiver cover 10 isconnected to the rear sight base 14, the projecting keyed edge 50 mayrest (or seat) opposite a complimentary shaped ledge 54 on the rear sitebase 14. Additionally, the spring loaded lever arm 36 and the projectingkeyed edge 50 may pinch (or clamp against) the rear sight base 14 tosecurely fix the distal end of the receiver cover 10 to the AK-47variant rifle 12.

FIG. 5 and FIG. 27 show a rear bottom port side 56 (or right side) viewof the receiver cover 10 of FIG. 1. The proximal end portion 58 of thereceiver cover 10 may include an inferior proximal rim 60 that mateswith a cut (or notch) 62 in the rear trunnion of the AK-47 variant rifle(FIG. 11 and FIG. 12). Disposed between the left and right side inferiorproximal rim segments 60 is an exterior channel 64 that provides accessto the receiver cover interior at the proximal base of the base ofreceiver cover. Above the inferior exterior channel 64 is a taperedprojection that may include a concave wall 66. The concave wall maysurround an opening 68 that provides access to the interior of thereceiver cover at a level above the receiver. The proximal opening 68may provide a passage to a yoke (or ring) 70 that is disposed on theinterior side of the proximal opening. Referring to FIG. 13, the taperedprojection may further include an inferior ear portion 72, which mayinclude a vertically aligned inferior bore 74. As shown in FIGS. 13, 16,17, and 18, the inferior bore 74 may extend from the top surface 76 ofthe tapered projection to an inner side wall 78 adjacent the proximalopening 68. Referring to FIGS. 13, 14, 16, 17, 18 and 19 the proximalend portion of the receiver cover further may include a superior ear 80and a thumb knob 82 disposed between the superior ear 80 and theinferior ear 72. The thumb knob 82 may include a textured side surface84, as well as a set screw (or locking pin) 86.

FIG. 29 and FIG. 30 show a bottom perspective view of the receiver cover10. As described above, the distal end of the receiver cover 10 mayinclude a keyed projecting edge 50 and a passage 40 for receiving apivot pin 42 (not shown) which may secure a spring loaded cantileverthat may be housed in the distal end portion of the accessory rail.Referring to FIG. 28, the proximal end wall 88 may include a majorinterior channel 90, which may be disposed generally perpendicular tothe inferior exterior channel 64. The major interior channel 90 mayextend into an interior bench 92 in the receiver cover. The end wall 94of the major exterior channel may form an oval shape and may include thebottom opening of the inferior bore 74. The longitudinal axis of themajor interior channel may be aligned with the central axis of theinferior bore. The proximal side wall 96 of the major exterior channelfurther may include an interior opening 98 of the receiver coverproximal opening 68. Additionally, a minor interior channel 100 may beformed in the interior bench 92 of the receiver cover. The minorinterior channel 100 may intersect the major interior channel 90. Theminor interior channel 100 may be bounded by lateral side walls. Theminor interior channel end wall 102 may form a generally rectangularshaped step that is spaced vertically from the end wall 94 of the majorexterior channel and the interior ceiling 104 of the receiver cover.

Referring to FIGS. 6, 7, 13, 14 and 26 an anchor (e.g., a yoke, ring,hook, loop, chain, bar etc) 70 may be disposed in the major interiorchannel 90. Referring to FIGS. 34, 35, 36, 37 and 38, the anchor 70 mayinclude an internal passage 134 that is sized and positioned within thereceiver cover to circumscribe the recoil spring guide button 110 andsecurely engage the spring guide button 110 when pressed against thespring guide button 110. Although anchor 70 may be configured anddimensioned to circumscribe the spring guide button 110 and engage thebottom surface of the spring guide button 110 to lock the proximal endof the receiver cover 10 to the receiver 108 of the AK-47 variant rifleany suitably shaped structure (e.g., a hook, loop, or a bar) may be usedto engage the spring guide or spring guide button 110 provided thespring guide engagement structure may securely interact with the springguide to fix the receiver cover to the receiver. Although the internalpassage may pass from one side the anchor to another side of the anchor,the passage may extend only partly into the body of the anchor.Referring to FIGS. 34 and 38, the anchor 70 may include a flat angledsurface 136 that is configured and dimensioned to allow the anchor toslip underneath the spring guide button 110 without contacting a portionof the spring guide 106 between the spring guide button 110 and base ofthe spring guide 118. For example, referring to FIG. 17, the flat angledsurface 136 and the portion of the spring guide 106 between the springguide button 110 and the base of the spring guide 118 may be parallel toeach other.

Referring to FIGS. 10 and 11, the receiver cover 10 may be connected toan AK-47 variant rifle 12. As shown in FIG. 10, the receiver cover 10may interlock with the rear sight base 14, the recoil spring guide 106,and the rear trunnion 16 to affect a secure connection between thereceiver cover 10 and the receiver 108 of the weapon. As shown in FIG.11, the rear recoil spring guide button 110 may be positioned within theanchor 70 of the receiver cover. By comparison, FIG. 12 shows theschematic AK-47 variant rifle of FIGS. 10 and 11 without the receivercover in order to illustrate the location and configuration of the rearsight 116, rear sight base 112 and receiver cover retention groove 114which mate with the rear site base connection site 20 at the distal (orfront) end of the receiver cover, as well as a pair of cuts (or notches)62 in the rear trunnion 16 for receiving the proximal rim 60 and ourtrunnion connection site 22 of the receiver cover. Further, FIG. 12 andFIG. 15 shows the base 118 of the recoil spring guide 106 of the AK-47variant rifle partly secured by the guide slot 120 of the rear trunnion16.

Referring to FIGS. 14, 15, 16, 17, 18, and 20 the base 118 of the rearrecoil spring guide may extend under the anchor 70 and be securelyseated in the recoil spring guide slot 120 of the rear trunnion 16. Thethumb knob 82, shaft 122 and anchor 70 may be operably associated suchthat rotating the thumb knob clock-wise moves the anchor toward thethumb knob (i.e., raises the anchor). Similarly, rotation of the thumbknob counter clock-wise may result in movement of the anchor away fromthe thumb knob (i.e., lowers the anchor). For example, as shown in FIG.19 the shaft 122 may be threaded 124 and the thumb knob 82 may be fixedto the shaft 122 with a lateral set pin or screw 86. Referring to FIGS.16, 17 and 18 the bore 140 in the anchor 70 which receives the inferiorend of the shaft also may be threaded such that clock-wise rotation ofthe shaft advances on the anchor, which may be disposed within the majorinterior channel, and raising it toward the thumb knob. In anotherexample, the interior bore of the thumb knob may be threaded and theanchor may be fixed to the inferior end of the shaft such that rotationof the thumb knob clock-wise advances the shaft upward drawing theanchor toward the thumb knob. Counter rotation of the thumb knob mayreverse the process and lower the anchor.

Referring to FIGS. 16, 17 and 21, the rotation of the thumb knob 82 maybe arrested and the position of the thumb knob may be selectively fixedby the presence of a smooth ball spring plunger 126 that is disposedunder the peripheral edge of the thumb knob. As shown in FIGS. 17, 18,19, 21, 31, 32 and 33 the lower surface of the thumb knob 82 may includea plurality of recesses 128. The recesses 128 may be uniformlydistributed about the periphery of the thumb knob's lower surface suchthat they form a circle. Referring to FIG. 17, the ball spring plunger126 may be positioned such that the spring biases the ball upward intocontact with the lower surface of the thumb knob. When the ball springplunger is aligned with a recess, the spring pushes the ball into therecess to fix the position of the thumb knob. As shown in FIGS. 16, 19and 21, the smooth ball spring plunger 126 may be seated in a seatingbore 130, which is disposed under an access bore 132.

As shown in FIG. 16, the distal end of the receiver cover may be securedto the rear sight base. The projecting keyed edge of the receiver covermay be pushed by an operator into the receiver cover retention groove(see e.g., FIG. 10) as the spring loaded cantilever is held in theraised position by depressing the proximal end of the lever to compressthe two compression springs. Once the projecting keyed edge of thereceiver cover is disposed in the receiver cover retention groove, thecantilever may be positioned into a lowered position by an operatorreleasing finger pressure on the proximal end of the lever arm. In theresulting configuration, a portion of the rear sight base is clampedbetween a distal end portion of the cantilever and the projecting keyededge of the receiver cover (see e.g. FIG. 17).

Referring to FIG. 18 and FIG. 43, the rear recoil spring guide 118 maybe positioned inside the recoil spring guide slot 120. As shown in FIGS.44 and 45, the rear recoil spring guide button 110 be positioned insidethe anchor 70. The proximal end of the receiver cover may be loweredsuch that the proximal rim 60 of the receiver cover 10 may be positionedinto a corresponding cut (or notch) 62 in the rear trunnion 16. Thecorresponding out (or notch) 62 in the rear trunnion may be referred toas a cover connection site. Referring to FIGS. 11 and 45, the thumb knob82 may be rotated to raise the yoke (or ring) 70. The lower side wall ofthe anchor 70 may move into contact with the bottom surface of the rearrecoil spring guide button 110. As the thumb knob is rotated further thedistance between the lower side wall of the anchor and the thumb knob isshortened and the receiver cover 10 is pulled down to seat on thereceiver 108 and rear trunnion 16. The thumb knob may be rotated furtherto lock the proximal end of the receiver cover to the rear trunnion.Referring to FIG. 17, the smooth ball spring plunger 126 may seat insidean opposing recess 128 on the thumb knob 82 to arrest rotation of theknob. As shown in FIG. 26, the base 118 of the rear recoil spring guide106 may be disposed in the external minor channel 64 when the proximalend of the receiver cover 10 is locked to the rear trunnion 16. Theproximal end of the receiver cover may be unlocked from the reartrunnion 16 by counter rotating the thumb knob 82 until the lower sidewall of the anchor 70 and the rear recoil spring guide 110 separate.Additional locks or devices may be added to the receiver cover lockingmechanisms to provide multi-level locking, and thus prevent unintendeddislocation of the primary locking mechanisms. For example, a secondlevel locking device, such as a screw or pin, may be incorporated on thedistal end receiver cover locking mechanism to prevent the cantileverfrom moving after it is engaged with the rear sight base.

FIGS. 39, 40, 41 and 42 show additional views of the exemplary lever ofFIG. 22. The lever may be a generally rectangular member. The lever,however, may be configured and dimensioned to rotate within the leverarm recess 48 of the receiver cover without binding. For example, therear end of lever may be rounded or include one or more beveled surfaces144 to prevent the lever 38 from pressing against the sides of the leverarm recess or, receiver cover. The lever may have flat bottom surface146. The lever may have a stepped upper surface 148. The stepped uppersurface may include a raised area 150 that is shaped to act as a thumblever. The stepped upper surface 148 may further include lower surfacewhich cooperates with the bottom surface to form the upper clampingmember 32. Also, the lever may have a streamlined contour such that theupper surface of the lever may be generally level with the receivercover when the lever is positioned by the biasing members 44. The bottomsurface may include one or more recesses 156. Each recess may receive abiasing member (e.g., such as a compression spring or leaf spring). Thelever may include one or more side surfaces which extend from thestepped upper surface 148 to the bottom surface. A through bore 158 mayextend from one side surface to another side surface. The through boremay be sized to receive the pivot 42 and positioned to cooperate withthe lever arm recess 48 to form a fulcrum 40 for the spring loaded leverarm 36.

FIG. 45 is another perspective view of an exemplary receiver cover 10secured to an AK-47 rifle 12. FIG. 43 is a perspective view of an AK-47rifle 12 with the receiver cover 10 removed. FIG. 44 is a perspectiveview of the distal end of the exemplary receiver cover 10 secured to theAK-47 rifle 12. The receiver cover may be formed from aluminum and thelocking parts may be formed from steel. The smooth ball spring plungermay be Part No. GN 614-NI manufactured by Elsa Ganter. The ball springplunger may possess a preloaded spring pressure of approximately 2.5 N.The ball spring plunger may possess a maximum load spring pressure ofapproximately 6 N.

The receiver cover may be manufactured from, without limitation,aircraft quality aluminum, titanium, steel or other alloys, and othermaterials or combination of materials. The component parts of the distalend receiver cover locking mechanism (e.g., lever, compression springs,pivot pin) and component parts of the proximal end receiver coverlocking mechanism (e.g., yoke/ring, shaft, thumb knob) may be formed,without limitation, from titanium, steel or other alloys. Additionally,engineering thermoplastic materials may be used to for the receivercover. Engineering thermoplastic materials which may be used mayinclude, without limitation, polyphenylene sulphide and partiallyaromatic nylon materials (e.g., Zytel® HTN).

Referring to FIG. 8 and FIG. 9, the receiver cover 10 may have a taperedprofile 160. The tapered profile 160 may prevent the receiver cover 10from hitting or snagging on environmental structures or equipment.Further, this may facilitate user operation by streamlining a user'sview toward an optical accessory that may be mounted on the accessoryrail. Additionally, referring to FIG. 8, the thumb knob may be shieldedby the front of the receiver cover to prevent the thumb knob 82 frominadvertently being rotated by inadvertent user movement or accidentalcontact from environmental structures or equipment.

While it has been illustrated and described what at present areconsidered to be preferred embodiments of the present invention, it willbe understood by those skilled in the art that various changes andmodifications may be made, and equivalents may be substituted forelements thereof without departing from the true scope of the invention.For example, the thumb knob may be a multi-lobe knob or the compressionsprings may be augmented or replaced with leaf springs. Additionally,features and or elements from any embodiment may be used singly or incombination with other embodiments. Therefore, it is intended that thespecification and examples be considered as exemplary only, with a truescope and spirit of the embodiments being indicated by the followingclaims.

What is claimed is:
 1. A cover for a receiver of a gun comprising: anelongated member having a first longitudinal axis, the elongated membercomprising a distal end portion which comprises; a leading edge which isconfigured and dimensioned to connect with a gun part; and a proximalend portion which is spaced from the distal end portion along the firstlongitudinal axis, and which comprises a proximal end wall, a proximalrim adjacent the proximal end wall, a first locking mechanism adjacentthe proximal end wall which comprises an anchor, and a positioningmember connected to the anchor such that movement of the positioningmember moves the anchor with respect to the proximal rim, and a blockingmember operatively associated with the positioning member the firstlocking mechanism comprising first and second operable configurationssuch that in the first configuration the blocking member arrestsmovement of the positioning member and in the second configuration theblocking member allows movement of the positioning member.
 2. The coverof claim 1, wherein the positioning member is movable with respect tothe anchor.
 3. The cover of claim 2, wherein the positioning member isrotatable with respect to the anchor.
 4. The cover of claim 3, whereinthe positioning member and the anchor are connected by mating screwthreads.
 5. The cover of claim 3, wherein rotation of the positioningmember in one direction moves the anchor away from the proximal rim. 6.The cover of claim 5, wherein counter rotation of the positioning membermoves the anchor toward the proximal rim.
 7. The cover of claim 1,wherein the anchor comprises a body which comprises a first surface, asecond surface spaced from the first surface, and a passage extendingfrom the first surface toward the second surface, the passage comprisinga first side wall.
 8. The cover of claim 7, wherein the first side wallis situated between the proximal rim and the blocking member.
 9. Thecover of claim 8, wherein the first side wall is positioned to anchoragainst a recoil spring guide of a gun.
 10. The cover of claim 9,wherein the passage extends from the first surface to the secondsurface.
 11. The cover of claim 1, wherein the positioning membercomprises a shaft that is connected to the anchor.
 12. The cover ofclaim 11, wherein the positioning member further comprises a knobconnected to the shaft such that moving the knob regulates the positionof the anchor with respect to the proximal rim.
 13. The cover of claim12, wherein the knob comprises a first exterior surface, and the firstexterior surface comprises a plurality of recesses, the plurality ofrecesses being selectively positionable opposite the blocking member.14. The cover of claim 13, wherein each of the plurality of recesses areconfigured and dimensioned to engage the blocking member to fix theposition of the knob.
 15. The cover of claim 14, wherein the blockingmember comprises a smooth ball spring plunger.
 16. The cover of claim11, wherein the shaft comprises a second longitudinal axis and the knobis rotatable about the second longitudinal axis.
 17. The cover of claim16, wherein the knob is fixed to the shaft.
 18. The cover of claim 1,further comprising a second locking mechanism adjacent the distal endportion which comprises a lever which comprises a distal end and aproximal end, the distal end of the lever being positioned adjacent theleading edge, and a biasing member positioned between the elongatedmember and the lever, the second locking mechanism comprising third andfourth configurations such that in the third configuration the distalend of the lever is biased toward the leading edge, and such that in thefourth configuration the proximal end of the lever compresses thebiasing member.
 19. The cover of claim 1, wherein the elongated membercomprises a tactical accessory rail.
 20. The cover of claim 1, whereinthe elongated member is configured and dimensioned to form a cover for areceiver of an AK-47 variant rifle.